Brother of Alec Kellaway.
Cousin of Arthur Chesney
Father of Bryan Kellaway.
Father of Peter Kellaway, pioneer in the clinical use of the electroencephalogram (EEG) test to evaluate patients with possible neurological difficulties. When Jack Ruby stood trial for the murder of Lee Harvey Oswald, President John F. Kennedy's assassin, Kellaway testified about the results of Ruby's EEG tests.
He and character actor Edmund Gwenn were cousins.
Interred at Westwood Memorial Park, Los Angeles, California, USA, in the Sanctuary of Remembrance.